<template>
  <div>
    <!-- 面包屑导航区域 -->
    <!-- <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb> -->

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        show-icon
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
      ></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            expand-trigger="hover"
            :options="cateListData"
            :props="cateProps"
            v-model="selectedCateKeys"
            @change="handleChange"
          >
          </el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数或属性的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 点击编辑的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
//tag标签实现思路  1.下拉选择，请求参数列表，传分类catID和选择项tab切换里的属性activename  2.拿到数据渲染，渲染到table表格里，别忘记给prop绑定自己数据字段  3.渲染的tag标签-给外面套一个作用域插槽,作用就是获取到当前行数据，给当前行绑定value,绑定是否可见  4.tag标签输入内容触发方法-把输入的内容加到原来数据里attr_vals里，合到一起提交  5.提交tab标签接口-需要大分类id,属性id,属性名字,tag拼接后的字符串,当前在哪个tab切换里

import {
  catelist,
  attrlist,
  addattr,
  delattr,
  getAttrById,
  updateattr,
} from "@/api/api.js";

export default {
  data() {
    return {
      // 商品分类列表
      cateListData: [],
      // 级联选择框的配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: "many",
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const res = await catelist();
      if (res.meta.status === 200) {
        this.$message.success("获取商品分类列表成功");
        this.cateListData = res.data;
      }
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    // tab 页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName);
      this.getParamsData();
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        this.$message.error("只允许选中第三级");
        return;
      }

      // 证明选中的是三级分类
      console.log(199, this.selectedCateKeys);
      // 根据所选分类的Id，和当前所处的面板，获取对应的参数
      const res = await attrlist({
        id: this.selectedCateKeys[2],
        sel: this.activeName,
      });
      console.log("参数列表", res);
      if (res.meta.status === 200) {
        this.$message.success("获取参数列表成功！");
        // 将数据中的 attr_vals 字符串，转换为数组，方便后续的渲染
        res.data.forEach((item) => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
          // 控制文本框的显示与隐藏
          item.inputVisible = false;
          // 文本框中输入的值
          item.inputValue = "";
        });

        console.log(res.data);
        if (this.activeName === "many") {
          this.manyTableData = res.data;
        } else {
          this.onlyTableData = res.data;
        }
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const res = await addattr({
          id: this.cateId,
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName,
        });

        if (res.meta.status === 201) {
          this.$message.success("添加参数成功！");
          this.addDialogVisible = false;
          this.getParamsData();
        }
      });
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog(attrId) {
      // 查询当前参数的信息

      const res = await getAttrById({
        cate_id: this.cateId,
        attr_id: attrId,
        attr_sel: this.activeName,
      });
      console.log(262, res);

      if (res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败！");
      }

      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 点击按钮，修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const res = await updateattr({
          id: this.cateId,
          attr_id: this.editForm.attr_id,
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName,
        });

        if (res.meta.status === 200) {
          this.$message.success("修改参数成功！");
          this.getParamsData();
          this.editDialogVisible = false;
        }
      });
    },
    // 根据Id删除对应的参数项
    async removeParams(attrId) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);

      // 用户取消了删除的操作
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除！");
      }

      // 删除的业务逻辑
      const res = await delattr({
        cate_id: this.cateId,
        attr_id: attrId,
      });

      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败！");
      }

      this.$message.success("删除参数成功！");
      this.getParamsData();
    },
    // 文本框失去焦点，或摁下了 Enter 都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      // 如果没有return，则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;
      // 需要发起请求，保存这次操作
      this.saveAttrVals(row);
    },
    // 将对 attr_vals 的操作，保存到数据库
    async saveAttrVals(row) {
      // 需要发起请求，保存这次操作
      let catId = this.selectedCateKeys[2];
      const res = await updateattr({
        id: catId,
        attr_id: row.attr_id,
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(" "),
      });

      if (res.meta.status === 200) {
        this.$message.success("修改参数项成功！");
      }
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      // 让文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    },
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      }
      return false;
    },
    // 当前选中的三级分类的Id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    },
  },
};
</script>

<style lang="scss" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>
